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下列说法错误的是                            （    ）A．水很难被压缩，这一事实说明水分子间存在相互作用的斥力B．衰变后产生的新核的中子数比多1C．一群处于n=4能级的氢原子向低能级跃迁时能放出六种不同频率的光子D．用红光照射某种金属能发生电效应，改用绿光照射该金属也能发生光电效应  As a music teacher for twenty-seven years．I have always known that music touches the soul(心灵)．It can break through all kinds of barriers(障碍)to reach students in a very special way．It can be the means for each child to find their light．A few years ago 1 was blessed with the chance to teach pre．school students one afternoon aweek．One of my most memorable students was Vanessa.She was five years old．had trouble walking and could not speak．We mostly sat on the floor for our music lessons and Vanessa 1iked to sit on my lap．One of her favorite songs was John the Rabbit．It was a call and response(回应)song where I sang the call and the students clapped two tirues while singing the repeating phrase“Oh yes”．Vanessa 1iked to put her hands together with mine and clap with me．We performed that song during every class Vanessa and l clapping together．She never said or sang a word．One day late in the school year when the song was finished，Vanessa turned around，looked atme in the eye，clapped her tiny hands two times and said the words“Oh yes!”I opened my mouth and could not speak.Through music we had made a connection．Several years later l came across Vanessa on the street in town。I stopped my car and waved to say hello．She waved back with a big smile on her face and then clapped her hands two timesmimicking(模仿)the song we had performed in our music class.This lovely little girl through her connection with music left an impression on me that will last forever,Every child has the ability to learn and grow．1t is up to us educators to discover the way toreach each and every one of our students。we all must find each child’s light.【1】The author(作者)thinks music ．A．can make children calm downB．can connect heart to heartC．is difficult for pre．school studentsD．is a good means to find a job【2】According to the second paragraph Vanessa ．A．got used to singing songsB．was too shy to speakC．was the youngest in the class D．enjoyed the author’s class【3】When Vanessa spoke the words“Oh yes!”the author felt ．A．surprised B．happyC．frightened D．satisfied【4】What can we infer from the last two paragraphs?A．The author has been in touch with Vanessa for several years．B．Vanessa has become as healthy as other children．C．The song made a deep impression on Vanessa．D．Being a good educator became Vanessa’s dream．